System and method for providing dynamic hybrid automatic repeat request (HARQ) codebook with multiple valid unicast downlink control information (DCI) per monitoring occasion index per serving cell

ABSTRACT

A method and system for determining a physical uplink control channel (PUCCH) resource are provided. The method includes ordering downlink control information (DCI) fields according to an order of serving cells for a monitoring occasion (MO), identifying a plurality of valid DCIs per MO per serving cell and determining the PUCCH resource from a last physical downlink control channel (PDCCH) in a last MO on the serving cell with a largest cell index.

PRIORITY

This application is based on and claims priority under 35 U.S.C. §119(e) to U.S. Provisional Patent Application Ser. Nos. 62/914,220,filed on Oct. 11, 2019, 62/892,792, filed on Aug. 28, 2019, 62/879,861,filed on Jul. 29, 2019, and 62/875,722, filed on Jul. 18, 2019, in theUnited States Patent and Trademark Office, the entire contents of whichare incorporated herein by reference.

FIELD

The present disclosure is generally related to wireless communicationsystems. In particular, the present disclosure is related to a systemand method for determining a physical uplink control channel resource.

BACKGROUND

In the Release 15 (Rel-15) hybrid automatic repeat request (HARQ)acknowledgement (ACK) (HARQ-ACK) codebook, the user equipment (UE) sendsthe ACK/NACK bits constructed by the codebook in a physical uplinkcontrol channel (PUCCH) that the UE transmits in slot n. For PUCCHtransmission, the UE uses a PUCCH resource to determine where in timeand frequency in slot n the UE should transmit PUCCH. The PUCCH resourceis determined by a PUCCH resource indicator (PRI) in the downlinkcontrol information (DCI) field present in the physical downlink controlchannel (PDCCH) scheduling the physical downlink shared channel (PDSCH).In the case of multiple DCI per monitoring occasion (MO), the UEbehavior is not clear and no specification is provided on how to choosethe PDCCH and the corresponding PRI.

SUMMARY

According to one embodiment, a method for determining a PUCCH resourceincludes ordering DCI fields according to an order of serving cells foran MO, identifying a plurality of valid DCIs per MO per serving cell anddetermining the PUCCH resource from a last PDCCH in a last MO on theserving cell with a largest cell index.

According to one embodiment, a system for determining a PUCCH resourceincludes a memory and a processor configured to order DCI fieldsaccording to an order of serving cells for an MO, identify a pluralityof valid DCIs per MO per serving cell and determine the PUCCH resourcefrom a last PDCCH in a last MO on the serving cell with a largest cellindex.

According to one embodiment, a method for providing a type-2 HARQcodebook for multiple DCI includes configuring a UE with a number ofvalid DCI slots per MO per scheduled cell and scheduling at least onevalid DCI per MO per the scheduled cell such that the UE transmitsHARQ-ACK bits of a corresponding number of PDSCHs in one PUCCH.

According to one embodiment, a base station for providing a type-2 HARQcodebook for multiple DCI includes a transmitter and a controllerconfigured to schedule at least one valid DCI per MO per a scheduledcell such that a UE transmits HARQ-ACK bits of a corresponding number ofPDSCHs in one PUCCH, configure the UE with a number of valid DCI slotsper MO per scheduled cell and transmit the at least one valid DCIthrough the transmitter.

BRIEF DESCRIPTION OF THE DRAWINGS

The above and other aspects, features, and advantages of certainembodiments of the present disclosure will be more apparent from thefollowing detailed description, taken in conjunction with theaccompanying drawings, in which:

FIG. 1 illustrates a diagram of DCI ordering for PUCCH resourcedetermination and Type-2 HARQ-ACK codebook construction, according to anembodiment;

FIG. 2 illustrates a diagram of DCI ordering for PUCCH resourcedetermination, and Type-2 HARQ-ACK codebook construction according to anembodiment;

FIG. 3 illustrates a diagram of a serving cell, according to anembodiment;

FIG. 4 illustrates a diagram of multiple DCI per MO per serving cell,according to an embodiment;

FIG. 5 illustrates a diagram of multiple DCI per MO per serving cell,according to an embodiment;

FIG. 6 illustrates a flowchart of steps in a method for determining aPUCCH resource, according to an embodiment;

FIG. 7 illustrates a flowchart of steps in a method for providing atype-2 HARQ codebook for multiple DCI, according to an embodiment; and

FIG. 8 illustrates a block diagram of an electronic device in a networkenvironment, according to one embodiment.

DETAILED DESCRIPTION

Hereinafter, embodiments of the present disclosure are described indetail with reference to the accompanying drawings. It should be notedthat the same elements will be designated by the same reference numeralsalthough they are shown in different drawings. In the followingdescription, specific details such as detailed configurations andcomponents are merely provided to assist with the overall understandingof the embodiments of the present disclosure. Therefore, it should beapparent to those skilled in the art that various changes andmodifications of the embodiments described herein may be made withoutdeparting from the scope of the present disclosure. In addition,descriptions of well-known functions and constructions are omitted forclarity and conciseness. The terms described below are terms defined inconsideration of the functions in the present disclosure, and may bedifferent according to users, intentions of the users, or customs.Therefore, the definitions of the terms should be determined based onthe contents throughout this specification.

The present disclosure may have various modifications and variousembodiments, among which embodiments are described below in detail withreference to the accompanying drawings. However, it should be understoodthat the present disclosure is not limited to the embodiments, butincludes all modifications, equivalents, and alternatives within thescope of the present disclosure.

Although the terms including an ordinal number such as first, second,etc. may be used for describing various elements, the structuralelements are not restricted by the terms. The terms are only used todistinguish one element from another element. For example, withoutdeparting from the scope of the present disclosure, a first structuralelement may be referred to as a second structural element. Similarly,the second structural element may also be referred to as the firststructural element. As used herein, the term “and/or” includes any andall combinations of one or more associated items.

The terms used herein are merely used to describe various embodiments ofthe present disclosure but are not intended to limit the presentdisclosure. Singular forms are intended to include plural forms unlessthe context clearly indicates otherwise. In the present disclosure, itshould be understood that the terms “include” or “have” indicateexistence of a feature, a number, a step, an operation, a structuralelement, parts, or a combination thereof, and do not exclude theexistence or probability of the addition of one or more other features,numerals, steps, operations, structural elements, parts, or combinationsthereof.

Unless defined differently, all terms used herein have the same meaningsas those understood by a person skilled in the art to which the presentdisclosure belongs. Terms such as those defined in a generally useddictionary are to be interpreted to have the same meanings as thecontextual meanings in the relevant field of art, and are not to beinterpreted to have ideal or excessively formal meanings unless clearlydefined in the present disclosure.

The electronic device according to one embodiment may be one of varioustypes of electronic devices. The electronic devices may include, forexample, a portable communication device (e.g., a smart phone), acomputer, a portable multimedia device, a portable medical device, acamera, a wearable device, or a home appliance. According to oneembodiment of the disclosure, an electronic device is not limited tothose described above.

The terms used in the present disclosure are not intended to limit thepresent disclosure but are intended to include various changes,equivalents, or replacements for a corresponding embodiment. With regardto the descriptions of the accompanying drawings, similar referencenumerals may be used to refer to similar or related elements. A singularform of a noun corresponding to an item may include one or more of thethings, unless the relevant context clearly indicates otherwise. As usedherein, each of such phrases as “A or B,” “at least one of A and B,” “atleast one of A or B,” “A, B, or C,” “at least one of A, B, and C,” and“at least one of A, B, or C,” may include all possible combinations ofthe items enumerated together in a corresponding one of the phrases. Asused herein, terms such as “1^(st),” “2nd,” “first,” and “second” may beused to distinguish a corresponding component from another component,but are not intended to limit the components in other aspects (e.g.,importance or order). It is intended that if an element (e.g., a firstelement) is referred to, with or without the term “operatively” or“communicatively”, as “coupled with,” “coupled to,” “connected with,” or“connected to” another element (e.g., a second element), it indicatesthat the element may be coupled with the other element directly (e.g.,wired), wirelessly, or via a third element.

As used herein, the term “module” may include a unit implemented inhardware, software, or firmware, and may interchangeably be used withother terms, for example, “logic,” “logic block,” “part,” and“circuitry.” A module may be a single integral component, or a minimumunit or part thereof, adapted to perform one or more functions. Forexample, according to one embodiment, a module may be implemented in aform of an application-specific integrated circuit (ASIC).

A HARQ-ACK codebook typically generates the HARQ-ACK bits of multiplePDSCHs and multiplexes them in a single PUCCH to transmit in lost n.Since there could be multiple PDCCHs, it may be helpful to clearlyindicate to the UE which PDCCH (DCI) it should obtain the PRI from. Thecurrent specification in Rel-15 as of the time of filing thisapplication states that PRI is determined based on the “last” DCI amongthe DCIs whose ACK/NACK is to be sent in the same slot n as specifiedbelow from Technical Specification (TS) 38.213:

“For a PUCCH transmission with HARQ-ACK information, a UE determines aPUCCH resource after determining a set of PUCCH resources for O^(UCI)HARQ-ACK information bits, as described in Subclause 9.2.1. The PUCCHresource determination is based on a PUCCH resource indicator field [5,TS 38.212] in a last DCI format 1_0 or DCI format 1_1, or DCI format 1_2among the DCI formats 1_0 or DCI formats 1_1 or DCI format 1_2 that havea value of a PDSCH-to-HARQ_feedback timing indicator field indicating asame slot for the PUCCH transmission, that the UE detects and for whichthe UE transmits corresponding HARQ-ACK information in the PUCCH where,for PUCCH resource determination, detected DCI formats are first indexedin an ascending order across serving cells indexes for a same PDCCHmonitoring occasion and are then indexed in an ascending order acrossPDCCH monitoring occasion indexes.”

Another issue with multiple DCI per MO is that dynamic HARQ-ACKcodebook, otherwise known as Type-2 HARQ-ACK codebook, may be modified.Currently, as of the time of filing this application, the pseudo-code inSection 9.1.3.1 of 3^(rd) Generation Partnership Project (3GPP) TS38.213 assumes up to 1 valid DCI per monitoring occasion ‘m’ perscheduled cell.

The following pseudo code is provided from the 3GPP TS 38.213 clause9.1.3. in Table 1.

TABLE 1 while m < M  while c < N_(cells) ^(DL)     if there is a PDSCHon serving cell c associated with PDCCH     in PDCCH monitoring occasionn, or there is a PDCCH     indicating SPS PDSCH release on serving cellc      if V_(C-DA,Ic,m) ^(DL) ≤ V_(temp)       j = j + 1      end if     .      .      .     end if  end while   m = m + 1    end while

As can be seen, for a given MO index m and a given serving cell(scheduled cell) c, if a DCI is detected (the meaning of “if there is aPDSCH on serving cell c . . . ” in the TS), the corresponding field inthe DCI (counter downlink assignment indicator (C-DAI)) is used todetermine the HARQ codebook size. As can be seen, if there are two validDCIs (there are 2 PDSCHs), the code in Table 1 only handles one of themand the other is not processed. This will result in a wrong codebooksize.

The present system and method determine the PUCCH resource for HARQ-ACKfor multiple DCI per monitoring occasion per serving cell. The presentsystem and method may implement different sorting techniques to sort thedetected PDCCHs (DCIs) in the last MO, and then obtaining the PUCCHresource from the PRI field in the “last” DCI. Regarding the Type-2HARQ-ACK codebook, the present system and method may provide differentsolutions to sort the PDCCHs within one MO per scheduled cell accordingto, for example, any of a start symbol of the scheduled PDSCH, a CORESETindex, a search space index, or an ordering method based on the valuesof C-DAI and total DAI (T-DAI).

The present system and method may determine the PUCCH resource for theHARQ-ACK codebook for Multi-DCI per MO per serving cell.

FIG. 1 illustrates a diagram of DCI ordering for PUCCH resourcedetermination and Type-2 HARQ-ACK codebook construction, according to anembodiment. In the example shown in FIG. 1 , there are four componentcarriers (CCs) CC0 through CC3, and four MO indices 102 through 108. Todetermine the PUCCH resource for HARQ-ACK bits in Rel-15, the DCIs areordered according to the ascending order of the serving cells for agiven MO index first and then ascending order of MO indices. Each squareon a CC represents a PDCCH MO. For example, in CC3, square 110represents an MO of index 0, square 112 represents an MO of index 1,square 114 represents an MO of index 2, and square 116 represents an MOof index 3. Inside each MO on a CC there can be up to 1 DCI for eachscheduled cell, (see index c in Table 1), which participates in the sameHARQ-ACK codebook. There are 13 DCIs within the 4 MO indices across allCCs. According to Rel-15, the DCIs are ordered first by MO and then(within each MO) by CC (in the depicted example, according to thearrowed curve 120). So the last DCI is the one in MO index 3 and CC3(square 116). The PM field in this DCI is used to determine the PUCCHresource for ACK/NACK bits of all DCIs. The ACK/NACK bits are given bythe HARQ codebook.

FIG. 2 illustrates a diagram of DCI ordering for PUCCH resourcedetermination and Type-2 HARQ-ACK codebook construction, according to anembodiment. In the depicted example there is an instance of multi-DCIper MO per serving cell, where there can be more than one valid DCI perMO per serving cell. The ordering of DCIs as given in Rel-15 cannotreadily determine which of the DCIs should be used to determine the PRI.For example, square 202 represents the MO index 3 at the CC3, and thisincludes two PDCCHs.

For the HARQ-ACK codebook, the PUCCH resource is determined from thelast PDCCH in the MO with the largest index and on a serving cell withthe largest cell index, and the system defines the last PDCCH asdescribed below.

In one example, the last PDCCH is identified as the one in the searchspace with the CORESET with the largest/smallest CORESET index, which isreferred to as the indicating CORESET. With multiple PDCCHs in theindicating CORESET, the UE does not expect indication with differentPUCCH resource indicators in those PDCCHs.

In one example, the last PDCCH is identified as the one in the searchspace with the largest/smallest search space ID regardless of theCORESET index, with the search space referred to as the indicatingsearch space. With multiple PDCCHs in the indicating search space, theUE does not expect indication with different PUCCH resource indicatorsin those PDCCHs.

In another example, the last PDCCH is identified as the one with thelargest/smallest resource block (RB) index (RB start frequency).Referring back to FIG. 2 , the square 202 includes a first PDCCH 204 anda second PDCCH 206. The second PDCCH 206 has a larger RB index, and thusmay be utilized for PUCCH resource determination.

In another example, the last PDCCH may be identified as the one with thelargest/smallest control channel element (CCE) index of the CORESET withlargest/smallest CORESET index.

FIG. 3 illustrates a diagram of a serving cell, according to anembodiment. The serving cell 302 includes a first PDCCH 304 thatcorresponds with a first PDSCH 314, a second PDCCH 306 that correspondswith a second PDSCH 316, and a third PDCCH 308 that corresponds with athird PDSCH 318. In one example, the last PDCCH may be identified as theone which schedules a PDSCH with the earliest/latest value of astart/end time. When all the PDCCHs are scheduling the earliest/latestvalue of the start/end time, the UE does not expect the PDCCHs toindicate different values of the PRIs. As shown in FIG. 3 , the secondPDCCH 306 may be selected and it's indicated PRI may be used todetermine the PUCCH resource for the HARQ-ACK, as the PDSCH 316 thatcorresponds to the PDCCH 306 is first in time.

In a further example, with more than one valid DCI in the largest MOindex in the serving cell with the largest index, the UE first ordersall the value DCIs according to an ordering rule and the uses the DCIwhich comes last (or first) in the ordered list to determine the PUCCHresource for ACK/NACK transmission. The PDCCH order rule may be based onthe values of the C-DAI. The system may employ a machine learning (ML)based ordering rule according to the values of the C-DAI of the validDCIs. The UE orders the DCIs in the last MO based on the largest C-DAIin the previous MO and all the valid DCIs in the last MO.

In another example, the last PDCCH is identified as to be any of thePDCCHs in the MO with the largest index on the serving cell with thelargest serving cell index. All the PDCCHs in the MO with the largestindex and on the serving cell with the largest serving cell indexindicate the same PDCCH resource.

The Rel-15 Type-2 HARQ-ACK codebook only works for one valid DCI per MOindex per serving (scheduled) cell for one HARQ-ACK payload. The presentsystem and method provide the type-2 HARQ-ACK codebook that works withmulti-DCI per MO per serving cells where all the DCIs indicate one slotfor HARQ-ACK transmission

With L_(max) being the maximum number of valid DCIs per serving cell,the Type-2 HARQ codebook pseudo code can be modified as shown in Table2.

TABLE 2 l = 0; m = 0; While m < M  While c < N_(cells) ^(DL)    If thereare L > 0 distinct PDCCHs in PDCCH monitoring    occasion m which eitherschedule a PDSCH on serving cell c    or indicate SPS PDSCH release,denote the PDCCHs as    PDCCH₀, PDCCH₁, . . . , PDCCH_(L−1) which areordered    according to the examples described herein.    l = 0    While l < L     l = l + 1     End while    End if    c = c + 1  Endwhile   m = m + 1 End while

The UE is configured with a maximum number of L_(max)=2^(l) valid DCIper MO per scheduled cell. The UE can be scheduled with L≤L_(max) validDCIs per MO per the scheduled cell such that the UE transmits theHARQ-ACK bits of the corresponding L PDSCHs in one PUCCH. The bit-widthof C-DAI field in DCI is set to log₂ L_(max)=1.

In a first example, the system utilizes the start RB index based C-DAIordering within the MO per serving cell. The system utilizes thestarting RB index of the PDCCH candidate (the candidate with lowerstarting RB index has lower C-DAI value). This method puts somerestriction on the network in terms of C-DAI ordering, and it may alsoput some burden on C-DAI processing at the UE if the UE's blind decoding(BD) order does not follow C-DAI order. Equivalently or similarly,PDCCHs are numbered from 1 to L in ascending order of starting RB index.For example, as shown in FIG. 2 , PDCCH 204 and 206 are numbered suchthat a PDCCH starting at a lower RB index comes before the one startingat a higher RB index.

In a second example, the PDCCHs are ordered according to the start/endtime of their corresponding PDSCHs. With two PDSCHs having the samestart/end time, the PDCCHs are ordered according to their CORESET ID. Ifthe CORESET IDs are the same, they are ordered according to the searchspace ID. For example, referring to FIG. 3 , if the start time of thePDSCH is chosen to order the PDCCHs, the PDCCH order is PDCCH 306, PDCCH308 and PDCCH 304.

The above two examples are reliable as the Rel-15 codebook where amaximum of 1 DCI per MO exists. The first and second examples above mayrequire a scheduling restriction on gNB, which is a value of C-DAI inthe detected DCI showing the accumulated number of present DCIs up tothe current PDCCH candidate. The scheduling PDCCH orders or C-DAI ordersare known to both gNB and UE.

In a third example, there is no explicit C-DAI ordering within the MOper serving cell. Even without explicit C-DAI ordering, the system canconsider the likelihood based C-DAI ordering in the pseudo codedescribed below for L_(max)=4. In this case, the L found PDCCHs, andhence the L found C-DAI values, are ordered based on a likelihoodmeasure.

For 4 DCIS decoded, the four cyclic shifts of (1,2,3,4) (1234, 4123,3412, and 2341) are valid sequences, and the C-DAI ordering can bedetermined by looking at the latest C-DAI decoded (adjusted by totalDAI) in previous MO. If the value of C-DAI before processing this MO was4, then 1234 is chosen, if 2 then 3412 is chosen, if 3 then 4123 ischosen and if 4 then 1234 is chosen.

For 3 DCIS decoded, 123, 231, 312, 124, 241, 412, 134, 341, 413, 234,342 and 423 are valid sequences. For each case, an ML decision can bemade on the latest C-DAI decoded in previous MO. For example, with{1,3,4}, which has 134, 341, 413 as valid sequences, if the previousC-DAI is 1, 341 is most likely. Assuming 341 gives 1341 which indicatesone miss between 1 and 3 (C-DAI sequence 12341). Assuming 134 gives1234, 1234 which indicates 4 DCI misses. Assuming 413 gives 1234123which indicates 3 DCI misses. The number of decoded DCI's in theprevious MO can also be used.

For 2 DCIS decoded, 12, 21, 13, 31, 14, 41, 23, 32, 24, 42, 34 and 43are possible orders. For each case, an ML decision can be made based onthe latest C-DAI decoded in previous MO. For example, with {1,4} as thefound DCIS, which has 14 or 41 as valid sequences, if the previous C-DAIis 3, then 41 is most likely. Assuming 41 gives 341 which indicates zeromisses while assuming 14 gives 341234, which indicates 3 misses. Thus,41 is more likely, so {4,1} is ordered as 41. The corresponding twoPDCCHs are found based on this ordering.

For 1 DCI decoded, no ordering is required.

The implicit ordering of the PDCCHs above can be implemented in apractical way by the UE using cyclic shift operators. With the cyclicshift operators, various ordering methods can be applied.

In one example, the UE detects the L DCIS (PDCCHs) with C-DAI values of(c₀, c₁, c_(L-1)). The UE orders the C-DAI values by sorting thedetected C-DAI values (c₀, c₁, . . . , c_(L-1)) in ascending order toobtain (c′₀, c′₁, . . . , c′_(L-1)), c′₀<c′₁< . . . <c′_(L-1) andapplying a cyclic shift in the amount of N_(CS) to obtain the orderedset (c″₀, c″₁, . . . , c″_(L-1)), where c″_(i)=c′_((i+N) _(CS)_()mod L). The UE determines the value of cyclic shift based on thecurrent value of C-DAI, c_(curr), before entering the added “while 1<L”loop and (c′₀, c′₁, . . . , c′_(L-1)), as follows: If none of the C-DAIvalues c′_(i), 0≤i≤L are larger than c_(curr), then the value of cyclicshift N_(CS)=0. If there are multiple C-DAI values which are larger thanc_(curr), the UE selects a C-DAI value c′_(k) among the multiple valuessuch that c′_(k)−c_(curr) is minimized. The value of N_(CS) is thenchosen to be k.

The ordered PDCCHs are then found as the first PDCCH is the PDCCH withC-DAI value of c″₀. The second PDCCH is the PDCCH with C-DAI value ofc″₁ and so on. The pseudo-code in Table 3 gives an algorithmic method toobtain the ordered PDCCHs from the detected PDCCHs and the current PDCCHwith the value of C-DAI=c_(curr).

TABLE 3 Input: 1) Current PDCCH with a value of C-DAI=c_(curr) in theDCI and 2) the detected PDCCHs by UE detected_PDCCH #0, detected_PDCCH#1, . . . , detected_PDCCH #(L − 1) in MO index m and serving cell indexc Output: The ordered PDCCHs, PDCCH₀, PDCCH₁, . . . , PDCCH_(L−1) Step0. Make an L -tuple (c₀, c₁, . . . , c_(L−1)) where c_(i) is the valueof C-DAI given by detected_PDCCH #i Step 1. Make an L-tuple (c′₀, c′₁, .. . , c′_(L−1)) from (c₀, c₁, . . . , c_(L−1)) by sorting the C-DAIvalues in ascending order, e.g., such that c′₀ < c′₁ < . . . < c′_(L−1)Step 2. Find cyclic shift value N_(CS): If none of the C-DAI valuesc′_(i), 0 ≤ i < L are larger than c_(curr)    N_(CS) = 0  Else   N_(CS)= argmin_(k|c′) _(k) _(>c) _(curr) c′_(k) End if Step 3. Make L-tuple(c″₀, c″₁, . . . , c″_(L−1)) by cyclic shifting of (c′₀, c′₁, . . . ,c′_(L−1)) to the left N_(CS) times.  c″_(i) = c′_((i+N) _(CS) _()mod L),for i = 0, . . . , L − 1 Step 4. Find the ordered PDCCHs, e.g.,PDCCH_(i), i = 0, . . . , L − 1 from the detected PDCCHs as follows Seti = 0 While i < L   Step 4-0. Find k, 0 ≤ k < L such that c″_(i) = c_(k)  Step 4-1. Set PDCCH_(i) as detected_PDCCH #k: PDCCH_(i) ←  detected_PDCCH #k End While

FIG. 4 illustrates a diagram of multiple DCI per MO per serving cell,according to an embodiment. Four DCIs are detected on CC1 and one DCI isdetected on CC0. Assuming L_(max)=4 and that the UE detects L=4 DCIswith corresponding 4 C-DAIs in the MO index m=1 on serving cell CC1,then the UE detects the DCIs in the order of C-DAI=(c₀, c₁, c₂,c₃)=(1,4,3,2). If the value of C-DAI when entering the while loop is 3from CC0, then (c₀, c₁, c₂, c₃) is ordered to obtain (c′₀, c′₁, c′₂,c′₃), =(1,2,3,4). In order to choose the value of cyclic shift thesmallest value c′_(k) which is also larger than current C-DAI,c_(curr)=3 is chosen to be c′_(k)=4, so N_(CS)=k=3. Applying the cyclicshift will give (c″₀, c″₁, c″₂, c″₃)=(4,1,2,3). This ordered set ofC-DAI is then used to enter the added “while” loop. In other words,although the UE has detected the C-DAIs in the order of (c₀, c₁, c₂,c₃)=(1,4,3,2), it will run the pseudo-code in the order of (c″₀, c″₁,c″₂, c″₃)=(4,1,2,3). In this way, UE has inferred the intended PDCCHorder by gNB

FIG. 5 illustrates a diagram of multiple DCI per MO per serving cell,according to an embodiment. Two DCIs are detected on CC1 and one DCI isdetected on CC0. Assuming L_(max)=4, only L=2 DCIs are detected in MOm=1 on serving cell CC1. Assuming the UE has detected the DCIs in theorder of C-DAI=(c₀, c₁)=(2,1), the value of C-DAI when entering thewhile loop is 3 from CC1. (c₀, c₁) is ordered to obtain (c′₀,c′₁)=(1,2). Since both of c′₀ and c′₁ are smaller than current C-DAI,c_(curr)=3 and the value of cyclic shift is N_(CS)=0. Applying thecyclic shift will give (c″₀, c″₁)=(1,2). This ordered set of C-DAI isused to enter the new “while” loop. In other words, although UE hasdetected the C-DAIS in the order of (c₀, c₁)=(2,1), it will run thepseudo-code in the order of (c″₀, c″₁)=(1,2). In this way, it hasinferred the intended PDCCH order by gNB. In this case, the C-DAIsequence 3→1→2 indicates one missing DCI with C-DAI=4 between 3 and 1.The UE considers the C-DAI sequence transmitted by gNB to be 3→4→1→2.

FIG. 6 illustrates a flowchart 600 of steps in a method for determininga PUCCH resource, according to an embodiment. At 602, the system ordersDCI fields according to an order of serving cells for an MO. At 604, thesystem identifies a plurality of valid DCIS per MO per serving cell. At606, the system determines the PUCCH resource from a last PDCCH in thelast MO on the serving cell with largest cell index.

The system may determine the PUCCH resource from the last PDCCH in theMO by identifying a PDCCH in a search space with a largest or smallestsearch space ID. The system may determine the PUCCH resource from thelast PDCCH in the MO by identifying a PDCCH with a largest or smallestRB index. The system may determine the PUCCH resource from the lastPDCCH in the MO by identifying a PDCCH with a largest or smallestcontrol channel element (CCE) index corresponding to a search space withsmallest/largest CORESET index. The system may determine the PUCCHresource from the last PDCCH in the MO by identifying a PDCCH whichschedules a PDSCH with an earliest or latest start time. The system maydetermine the PUCCH resource from the last PDCCH in the MO byidentifying a PDCCH which schedules a PDSCH with an earliest or latestend time. The system may determine the PUCCH resource from the lastPDCCH in the MO by identifying a PDCCH according to an ordering rulebased on values of a C-DAI. The system may determine the PUCCH resourcefrom the last PDCCH in the MO by identifying a PDCCH in the MO with alargest index on the serving cell.

FIG. 7 illustrates a flowchart 700 of steps in a method for providing atype-2 HARQ codebook for multiple DCI, according to an embodiment. At702, the system configures a UE with a number of valid DCI slots per MOper scheduled cell. The system may configure the UE with the maximumnumber of valid DCI slots per MO per scheduled cell. The maximum numberof valid DCIs per MO per scheduled cell can be determined based on theUE reporting it as a capability to the network and/or the networkconfiguring the number to the UE via radio resource control (RRC). At704, the system schedules at least one valid DCI per MO per thescheduled cell such that the UE transmits HARQ-ACK bits of acorresponding number of PDSCHs in one PUCCH.

The system may utilize a start RB index based on C-DAI ordering withinthe MO per scheduled cell. The system may order PDCCHs according to astart time or an end time of a corresponding PDSCH. The system may orderfound C-DAI values based on a likelihood measured determined from acyclic shift value.

FIG. 8 illustrates a block diagram of an electronic device 801 in anetwork environment 800, according to one embodiment. Referring to FIG.8 , the electronic device 801 (e.g., a base station with a transceiver)in the network environment 800 may communicate with an electronic device802 via a first network 898 (e.g., a short-range wireless communicationnetwork), or an electronic device 804 or a server 808 via a secondnetwork 899 (e.g., a long-range wireless communication network). Theelectronic device 801 may communicate with the electronic device 804 viathe server 808. The electronic device 801 may include a processor 820, amemory 830, an input device 850, a sound output device 855, a displaydevice 860, an audio module 870, a sensor module 876, an interface 877,a haptic module 879, a camera module 880, a power management module 888,a battery 889, a communication module 890, a subscriber identificationmodule (SIM) 896, or an antenna module 897. In one embodiment, at leastone (e.g., the display device 860 or the camera module 880) of thecomponents may be omitted from the electronic device 801, or one or moreother components may be added to the electronic device 801. In oneembodiment, some of the components may be implemented as a singleintegrated circuit (IC). For example, the sensor module 876 (e.g., afingerprint sensor, an iris sensor, or an illuminance sensor) may beembedded in the display device 860 (e.g., a display).

The processor 820 may execute, for example, software (e.g., a program840) to control at least one other component (e.g., a hardware or asoftware component) of the electronic device 801 coupled with theprocessor 820, and may perform various data processing or computations.As at least part of the data processing or computations, the processor820 may load a command or data received from another component (e.g.,the sensor module 876 or the communication module 890) in volatilememory 832, process the command or the data stored in the volatilememory 832, and store resulting data in non-volatile memory 834. Theprocessor 820 may include a main processor 821 (e.g., a centralprocessing unit (CPU) or an application processor (AP)), and anauxiliary processor 823 (e.g., a graphics processing unit (GPU), animage signal processor (ISP), a sensor hub processor, or a communicationprocessor (CP)) that is operable independently from, or in conjunctionwith, the main processor 821. Additionally or alternatively, theauxiliary processor 823 may be adapted to consume less power than themain processor 821, or execute a particular function. The auxiliaryprocessor 823 may be implemented as being separate from, or a part of,the main processor 821.

The auxiliary processor 823 may control at least some of the functionsor states related to at least one component (e.g., the display device860, the sensor module 876, or the communication module 890) among thecomponents of the electronic device 801, instead of the main processor821 while the main processor 821 is in an inactive (e.g., sleep) state,or together with the main processor 821 while the main processor 821 isin an active state (e.g., executing an application). According to oneembodiment, the auxiliary processor 823 (e.g., an image signal processoror a communication processor) may be implemented as part of anothercomponent (e.g., the camera module 880 or the communication module 890)functionally related to the auxiliary processor 823.

The memory 830 may store various data used by at least one component(e.g., the processor 820 or the sensor module 876) of the electronicdevice 801. The various data may include, for example, software (e.g.,the program 840) and input data or output data for a command relatedthereto. The memory 830 may include the volatile memory 832 or thenon-volatile memory 834.

The program 840 may be stored in the memory 830 as software, and mayinclude, for example, an operating system (OS) 842, middleware 844, oran application 846.

The input device 850 may receive a command or data to be used by othercomponent (e.g., the processor 820) of the electronic device 801, fromthe outside (e.g., a user) of the electronic device 801. The inputdevice 850 may include, for example, a microphone, a mouse, or akeyboard.

The sound output device 855 may output sound signals to the outside ofthe electronic device 801. The sound output device 855 may include, forexample, a speaker or a receiver. The speaker may be used for generalpurposes, such as playing multimedia or recording, and the receiver maybe used for receiving an incoming call. According to one embodiment, thereceiver may be implemented as being separate from, or a part of, thespeaker.

The display device 860 may visually provide information to the outside(e.g., a user) of the electronic device 801. The display device 860 mayinclude, for example, a display, a hologram device, or a projector andcontrol circuitry to control a corresponding one of the display,hologram device, and projector. According to one embodiment, the displaydevice 860 may include touch circuitry adapted to detect a touch, orsensor circuitry (e.g., a pressure sensor) adapted to measure theintensity of force incurred by the touch.

The audio module 870 may convert a sound into an electrical signal andvice versa. According to one embodiment, the audio module 870 may obtainthe sound via the input device 850, or output the sound via the soundoutput device 855 or a headphone of an external electronic device 802directly (e.g., wired) or wirelessly coupled with the electronic device801.

The sensor module 876 may detect an operational state (e.g., power ortemperature) of the electronic device 801 or an environmental state(e.g., a state of a user) external to the electronic device 801, andthen generate an electrical signal or data value corresponding to thedetected state. The sensor module 876 may include, for example, agesture sensor, a gyro sensor, an atmospheric pressure sensor, amagnetic sensor, an acceleration sensor, a grip sensor, a proximitysensor, a color sensor, an infrared (IR) sensor, a biometric sensor, atemperature sensor, a humidity sensor, or an illuminance sensor.

The interface 877 may support one or more specified protocols to be usedfor the electronic device 801 to be coupled with the external electronicdevice 802 directly (e.g., wired) or wirelessly. According to oneembodiment, the interface 877 may include, for example, a highdefinition multimedia interface (HDMI), a universal serial bus (USB)interface, a secure digital (SD) card interface, or an audio interface.

A connecting terminal 878 may include a connector via which theelectronic device 801 may be physically connected with the externalelectronic device 802. According to one embodiment, the connectingterminal 878 may include, for example, an HDMI connector, a USBconnector, an SD card connector, or an audio connector (e.g., aheadphone connector).

The haptic module 879 may convert an electrical signal into a mechanicalstimulus (e.g., a vibration or a movement) or an electrical stimuluswhich may be recognized by a user via tactile sensation or kinestheticsensation. According to one embodiment, the haptic module 879 mayinclude, for example, a motor, a piezoelectric element, or an electricalstimulator.

The camera module 880 may capture a still image or moving images.According to one embodiment, the camera module 880 may include one ormore lenses, image sensors, image signal processors, or flashes.

The power management module 888 may manage power supplied to theelectronic device 801. The power management module 888 may beimplemented as at least part of, for example, a power managementintegrated circuit (PMIC).

The battery 889 may supply power to at least one component of theelectronic device 801. According to one embodiment, the battery 889 mayinclude, for example, a primary cell which is not rechargeable, asecondary cell which is rechargeable, or a fuel cell.

The communication module 890 may support establishing a direct (e.g.,wired) communication channel or a wireless communication channel betweenthe electronic device 801 and the external electronic device (e.g., theelectronic device 802, the electronic device 804, or the server 808) andperforming communication via the established communication channel. Thecommunication module 890 may include one or more communicationprocessors that are operable independently from the processor 820 (e.g.,the AP) and supports a direct (e.g., wired) communication or a wirelesscommunication. According to one embodiment, the communication module 890may include a wireless communication module 892 (e.g., a cellularcommunication module, a short-range wireless communication module, or aglobal navigation satellite system (GNSS) communication module) or awired communication module 894 (e.g., a local area network (LAN)communication module or a power line communication (PLC) module). Acorresponding one of these communication modules may communicate withthe external electronic device via the first network 898 (e.g., ashort-range communication network, such as Bluetooth™, wireless-fidelity(Wi-Fi) direct, or a standard of the Infrared Data Association (IrDA))or the second network 899 (e.g., a long-range communication network,such as a cellular network, the Internet, or a computer network (e.g.,LAN or wide area network (WAN)). These various types of communicationmodules may be implemented as a single component (e.g., a single IC), ormay be implemented as multiple components (e.g., multiple ICs) that areseparate from each other. The wireless communication module 892 mayidentify and authenticate the electronic device 801 in a communicationnetwork, such as the first network 898 or the second network 899, usingsubscriber information (e.g., international mobile subscriber identity(IMSI)) stored in the subscriber identification module 896.

The antenna module 897 may transmit or receive a signal or power to orfrom the outside (e.g., the external electronic device) of theelectronic device 801. According to one embodiment, the antenna module897 may include one or more antennas, and, therefrom, at least oneantenna appropriate for a communication scheme used in the communicationnetwork, such as the first network 898 or the second network 899, may beselected, for example, by the communication module 890 (e.g., thewireless communication module 892). The signal or the power may then betransmitted or received between the communication module 890 and theexternal electronic device via the selected at least one antenna.

At least some of the above-described components may be mutually coupledand communicate signals (e.g., commands or data) therebetween via aninter-peripheral communication scheme (e.g., a bus, a general purposeinput and output (GPIO), a serial peripheral interface (SPI), or amobile industry processor interface (MIPI)).

According to one embodiment, commands or data may be transmitted orreceived between the electronic device 801 and the external electronicdevice 804 via the server 808 coupled with the second network 899. Eachof the electronic devices 802 and 804 may be a device of a same type as,or a different type, from the electronic device 801. All or some ofoperations to be executed at the electronic device 801 may be executedat one or more of the external electronic devices 802, 804, or 808. Forexample, if the electronic device 801 should perform a function or aservice automatically, or in response to a request from a user oranother device, the electronic device 801, instead of, or in additionto, executing the function or the service, may request the one or moreexternal electronic devices to perform at least part of the function orthe service. The one or more external electronic devices receiving therequest may perform the at least part of the function or the servicerequested, or an additional function or an additional service related tothe request, and transfer an outcome of the performing to the electronicdevice 801. The electronic device 801 may provide the outcome, with orwithout further processing of the outcome, as at least part of a replyto the request. To that end, a cloud computing, distributed computing,or client-server computing technology may be used, for example.

One embodiment may be implemented as software (e.g., the program 840)including one or more instructions that are stored in a storage medium(e.g., internal memory 836 or external memory 838) that is readable by amachine (e.g., the electronic device 801). For example, a processor ofthe electronic device 801 may invoke at least one of the one or moreinstructions stored in the storage medium, and execute it, with orwithout using one or more other components under the control of theprocessor. Thus, a machine may be operated to perform at least onefunction according to the at least one instruction invoked. The one ormore instructions may include code generated by a complier or codeexecutable by an interpreter. A machine-readable storage medium may beprovided in the form of a non-transitory storage medium. The term“non-transitory” indicates that the storage medium is a tangible device,and does not include a signal (e.g., an electromagnetic wave), but thisterm does not differentiate between where data is semi-permanentlystored in the storage medium and where the data is temporarily stored inthe storage medium.

According to one embodiment, a method of the disclosure may be includedand provided in a computer program product. The computer program productmay be traded as a product between a seller and a buyer. The computerprogram product may be distributed in the form of a machine-readablestorage medium (e.g., a compact disc read only memory (CD-ROM)), or bedistributed (e.g., downloaded or uploaded) online via an applicationstore (e.g., Play Store™), or between two user devices (e.g., smartphones) directly. If distributed online, at least part of the computerprogram product may be temporarily generated or at least temporarilystored in the machine-readable storage medium, such as memory of themanufacturer's server, a server of the application store, or a relayserver.

According to one embodiment, each component (e.g., a module or aprogram) of the above-described components may include a single entityor multiple entities. One or more of the above-described components maybe omitted, or one or more other components may be added. Alternativelyor additionally, a plurality of components (e.g., modules or programs)may be integrated into a single component. In this case, the integratedcomponent may still perform one or more functions of each of theplurality of components in the same or similar manner as they areperformed by a corresponding one of the plurality of components beforethe integration. Operations performed by the module, the program, oranother component may be carried out sequentially, in parallel,repeatedly, or heuristically, or one or more of the operations may beexecuted in a different order or omitted, or one or more otheroperations may be added.

Although certain embodiments of the present disclosure have beendescribed in the detailed description of the present disclosure, thepresent disclosure may be modified in various forms without departingfrom the scope of the present disclosure. Thus, the scope of the presentdisclosure shall not be determined merely based on the describedembodiments, but rather determined based on the accompanying claims andequivalents thereto.

What is claimed is:
 1. A method of providing a type-2 hybrid automaticrepeat request (HARD) codebook for multiple downlink control information(DCI), comprising: configuring a user equipment (UE) with a number ofvalid DCI slots per monitoring occasion (MO) per scheduled cell; andscheduling a plurality of valid DCIs per MO per the scheduled cell suchthat the UE transmits HARQ-Acknowledge (HARQ-ACK) bits of a number ofphysical downlink shared channels (PDSCHs) in one physical uplinkcontrol channel (PUCCH), wherein the number of PDSCHs corresponds to anumber of the plurality of valid DCIs, wherein counter-downlinkassignment indicator (C-DAI) values in the plurality of valid DCIs areordered based on a likelihood measure determined from a cyclic shiftvalue.
 2. The method of claim 1, further comprising ordering physicaldownlink control channels (PDCCHs) corresponding to the plurality ofvalid DCIs according to an order of the C-DAI values.
 3. A base stationfor providing a type-2 hybrid automatic repeat request (HARD) codebookfor multiple downlink control information (DCI), comprising: atransmitter; and a controller configured to: schedule a plurality ofvalid DCIs per monitoring occasion (MO) per a scheduled cell such that auser equipment (UE) transmits HARQ-Acknowledge (HARQ-ACK) bits of anumber of physical downlink shared channels (PDSCHs) in one physicaluplink control channel (PUCCH), wherein the number of PDSCHs correspondsto a number of the plurality of valid DCIs; configure the UE with anumber of valid DCI slots per MO per scheduled cell; and transmit theplurality of valid DCIs through the transmitter, whereincounter-downlink assignment indicator (C-DAI) values in the plurality ofvalid DCIs are ordered based on a likelihood measure determined from acyclic shift value.
 4. The base station of claim 3, wherein thecontroller is further configured to order physical downlink controlchannels (PDCCHs) corresponding to the plurality of valid DCIs accordingto an order of the C-DAI values.